Neptune Apex Optical Sensor with Magnetic Mount (OS-1 M) saltwater fish The upper and lower fins

The upper and lower fins

When using Alkaline Buffer™ & Acid Buffer™ together to target a specific pH

#at4-share

Available in four sizes: 10 gal

Spongebob - 2''

Neptune Apex Optical Sensor with Magnetic Mount (OS-1 M) saltwater fish The upper and lower finsWhether for your ATO reservoir, to use as a sump high alert, or for your long term water storage such as a brute container, these optical sensors plugin into the FMM. In standalone use when used in your ATO reservoir (plugged into port 4), the FMM will stop your PMUP and sound an alarm when the sensor is above the water level. If you plug it into port 3, and mount it high in your sump, if your water level ever goes that high, an alarm will sound and